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3 years ago

What is matter? What is it made up of?

1 answer:

5 0

A definition of "matter" more fine-scale than the atoms and molecules definition is: matter is made up of what atoms and molecules are made of, meaning anything made of positively charged protons, neutral neutrons, and negatively charged electrons. There are three states of matter, they are: solid, liquid and gas. In extreme environments, other states may be present, such as plasma, Bose-Einstein condensates and neutron stars .

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Determine the mass in grams of each of the following:

lukranit [14]

Answer:

A) 9.60 g

B) 19.2 g

C) 28.8 g

Explanation:

A) Elemental oxygen mass is 16.00 g/mol, so in 0.600 mol of elementar oxygen there is 9.60 g

0.600 mol x 16.00 g/mol=9.60 g

B) Oxygen molecular mass is 32.00 g/mol, so in 0.600 mol of oxygen molecules there is 19.2 g

0.600 mol x 32.00 g/mol=19.2 g

C) Ozone molecular mass is 48.00 g/mol, so in 0.600 mol of oxygen molecules there is 28.8 g

0.600 mol x 48.00 g/mol=28.8 g

7 0

3 years ago

How can you distinguish between a physical change and a chemical change?

AleksAgata [21]

Answer:

Physical Change

When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged.
Physical change is a temporary change.
A Physical change affects only physical properties i.e. shape, size, etc.
A physical change involves very little to no absorption of energy.
Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. .
In a physical change, no new substance is formed.
Physical change is easily reversible i.e original substance can be recovered.

Chemical Change

When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.
.A chemical change is a permanent change.
Chemical change both physical and chemical properties of the substance including its composition
During a chemical reaction, absorption and evolution of energy take place.
A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
A chemical change is always accompanied by one or more new substance(s).
Chemical changes are irreversible i.e. original substance cannot be recovered.

8 0

3 years ago

Convert to moles:<br> 100.0g Ca3(PO4)2

salantis [7]

Answer:

0.322 moles

Explanation:

Given Mass, m = 100 g

The molar mass of Ca₃(PO₄)₂

Ca₃(PO₄)₂ = (3 x 40.08) + (2 x 30.97) + (8 x 16.00)

M = 310.18 g/mol

Let there are n number of moles,

n = given mass/ molar mass

$n=\dfrac{100 }{310.18 }\\\\n=0.322\ mol$

So, there are 0.322 moles.

6 0

3 years ago

How many grams of RbOH are present in 35.0 mL of a 5.50 M RbOH solution?

Ganezh [65]

I think 5.50 M x 35.0 mL x molar mass of RbOH = mass (g)

8 0

4 years ago

What are 3 household substances that contain acids and say why are they useful

Nonamiya [84]

Answer:

battery. you use it for your remotes. vinegar. you use vinegar for cooking of cleaning. nail polish remover. you use this for removing nail polish

6 0

3 years ago